Overwrite and Delete lines from data file

Hi Kel,

I think you need to read the whole file into memory, update the data ( in your case, delete one of the line ), and write the whole thing back again.

Another way is instead of using text file, you can use binary file with a fix length for all your records, by doing so, it is possible to update the record that you are interested in and not need to write the whole file just to update one record

you can read your lines of string from file into an array of string, update/delete the string in the array, and write the array of string back to the file.

Originally posted by Kel
is there anyway to capture the line for the the data i want to remove or update?

need it v.urgently
Here #include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
std::ifstream in("input_file_name",std::ios::binary);
if (!in)
{
std::cout << "problem with file open" << std::endl;
return 0;
}

// determine length of file

in.seekg(0,std::ios::end);
unsigned long length = in.tellg();
in.seekg(0,std::ios::beg);

string str(length,0); // create a string of the appropriate length

// copy file into the string

std::copy( std::istreambuf_iterator<char>(in) ,
std::istreambuf_iterator<char>() ,
str.begin() );

cout << str;

return 0;
}
That code is by Philip Nicoletti
Philip is always nice and kind to everyone on this forum.., he will come to workplace shortly after this(an hour later), I hope he will join help you with some other information...

Regards

thanks but i need it for my sdi application.

sorry for posting so mani times because i really need it urgently